A Hybrid Electrode of Co(3)O(4)@PPy Core/Shell Nanosheet Arrays for High-Performance Supercapacitors.

A Hybrid Electrode of Co(3)O(4)@PPy Core/Shell Nanosheet Arrays for High-Performance Supercapacitors.
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用于高性能超级电容器的Co3O4@PPy核/壳纳米片阵列混合电极

DOI:
10.1007/s40820-015-0069-x
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发表时间:
2016
期刊:
影响因子:
26.6
通讯作者:
Hu J
Hu J
中科院分区:
材料科学1区
文献类型:
--
作者:
Yang X;Xu K;Zou R;Hu J

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在此,结合溶剂热法和电沉积法,我们生长了独特的混合纳米片阵列组成的Co 3 O 4纳米片为核心,聚吡咯作为外壳。得益于PPy作为导电聚合物提高电子传输速率以及来自这种核/壳结构的协同效应,由Co3O4@PPy核/壳纳米片阵列制成的混合电极在2 mA cm-2的电流密度下表现出2.11 F cm-2的大面积电容,与原始Co 3 O 4电极相比提高了约4倍;此外,该混合电极还显示出良好的倍率性能(从2到20 mA cm-2的初始电容保持约65%)和上级的循环性能(5000次循环后电容保持约85.5%)。此外,Co3O4@PPy混合电极的等效串联电阻值(0.238 Ω)显著低于原始Co 3 O 4电极的等效串联电阻值(0.319 Ω)。这些结果意味着Co3O4@PPy杂化复合材料具有制造下一代能量存储和转换器件的潜力。
Herein, combining solverthermal route and electrodeposition, we grew unique hybrid nanosheet arrays consisting of Co3O4nanosheet as a core, PPy as a shell. Benefiting from the PPy as conducting polymer improving an electron transport rate as well as synergistic effects from such a core/shell structure, a hybrid electrode made of the Co3O4@PPy core/shell nanosheet arrays exhibits a large areal capacitance of 2.11 F cm−2at the current density of 2 mA cm−2, a ~4-fold enhancement compared with the pristine Co3O4electrode; furthermore, this hybrid electrode also displays good rate capability (~65 % retention of the initial capacitance from 2 to 20 mA cm−2) and superior cycling performance (~85.5 % capacitance retention after 5000 cycles). In addition, the equivalent series resistance value of the Co3O4@PPy hybrid electrode (0.238 Ω) is significantly lower than that of the pristine Co3O4electrode (0.319 Ω). These results imply that the Co3O4@PPy hybrid composites have a potential for fabricating next-generation energy storage and conversion devices.
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